Note 3 - Loans and Allowance for Credit Losses (Details Textual) - USD ($) |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) | $ 100,000 | $ 100,000 | ||||
| Financing Receivable, Deferred Commitment Fee | 1,600,000 | 1,000,000 | ||||
| Loan Participations and Whole Loans Sold to and Serviced for Others Not on Balance Sheet | 44,700,000 | 38,200,000 | ||||
| Loan Participations and Whole Loans Sold to and Serviced For Others Unpaid Principal Balance | 239,200,000 | 175,000,000 | ||||
| Loans and Leases Receivable, Related Parties | 34,749,000 | 43,647,000 | $ 46,000,000 | |||
| Financing Receivable, Accrued Interest, after Allowance for Credit Loss | 12,100,000 | 12,500,000 | ||||
| Provision for Loan, Lease, and Other Losses | (3,391,000) | (3,480,000) | (2,000,000) | |||
| Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | [1] | (3,774,000) | (3,191,000) | (1,964,000) | ||
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | $ 3,300,000 | $ 3,861,000 | $ 734,000 | 3,017,000 | ||
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) | (2,300,000) | |||||
| Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Interest Receivable | Interest Receivable | ||||
| Unfunded Loan Commitment [Member] | ||||||
| Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | $ 400,000 | $ (300,000) | $ (36,000) | |||
| Nonperforming Financial Instruments [Member] | ||||||
| Loans and Leases Receivable, Related Parties | $ 0 | $ 0 | ||||
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